That definitely does not look like standard 'wear and tear'. The issue on my diver's side pillar is a lot, lot less worse than the least affected pillar on your passenger side doors and my car is 2 years older than yours.
To me it looks like it is within your Australian consumer rights to ask for a replacement on a 1.5 year old car, but I'll leave it some more knowledgeable people here to chime in and maybe provide a DIY fix.
Is there a chance you may have spilled something there, even washer fluid? Reason is that it looks slightly 'splash' patchy from droplets.